https://app.knowbase.one/vault/rfc/docid/9128
RFC8425: IANA Considerations for IPv6 Neighbor Discovery Prefix Information Option Flags
Internet Engineering Task Force (IETF) O. Troan Request for Comments: 8425 Cisco Systems Updates: 4861 July 2018 Category: Standards Track ISSN: 2070-1721 IANA Considerations...